TTT - ttt_pick コマンド †概要 †TTT の実行結果から特定地点のtravel timeを抽出するコマンド． $ ttt_pick --help
ttt_pick 3.2.2 [32-bit] - Sampling of a 2-D gridded travel time file at specified locations
usage: ttt_pick <xyfile> -G<ttt_file> [-D] [-H[<n>]] [-V] [-Z<depth>,<depth.i2>] [-h|m|s] [-:]
<xyfile> is a multicolumn ASCII file with (lon,lat) in the first two columns
-G <ttt_file> is the name of the 2-D grid produced by ttt.
OPTIONS:
-D will report the distance to the nearest non-NaN node in last column [no report]
-H means <xyfile> has one or more (append <n>) header records
-I Travel times in l837559 were stored as 2 byte ints with units of 10 sec [Default is 4-byte float in hours]
-V for verbal feedback; will report progress
-Z Sample travel time at point nearest to station where water depth is <depth> m or deeper.
Give <depth.grd> is the name of the bathymetry grid used to calculate the travel times.
Note <depth> is negative below the sea surface [Default is no depth search]
-h|m|s reports travel times in hours, minutes, or seconds [hours]
-: <xyfile> contains lat,lon instead of lon,lat
使用例 †TTT の実行結果のファイルを -G オプションの次にファイル名で指定する． 求める地点が1地点でけであれば echo "132.5 30.5" | ttt_pick -Gttt_result.b で抽出できる．出力は，経度，緯度，走時（in hour）の列構成で，3列目がほしい値． まとめてやるなら awk '{print $2, $3}' file_ttt.txt | ttt_pick -Gsource_0100.b > traveltime_0100.txt
などのようにやると便利． |